Hi, Peanut, and welcome! Yes, I have costochondritis, too. It is painful and it hurts to breathe sometimes. My doctor has me on ibuprofen with food to help with that. Gentle stretching exercises help, too.
Be sure to check out Fibro 101 ...the second thread on the forum. There are links to good info about fibro, including a link all about costochondritis and a link to gentle stretching exercises that really do help.
I'm so glad you found us and joined in. Don't hesitate to ask questions because we are here to help you. I hope to hear more from you soon.
Sherrine